References
Les, D.H. 1989. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), IV. Summary of proposed relationships and evolutionary trends. Systematic Bot. 14: 254-262. Google Scholar
Les, D.H. 1989. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), IV. Summary of proposed relationships and evolutionary trends. Systematic Bot. 14: 254-262. Google Scholar